Portland City Code ch. 14 (Land Use Code)

Citation: Portland City Code ch. 14 (Land Use Code)
Jurisdiction: Portland (municipal)
Source: Official source
Original Source: https://content.civicplus.com/api/assets/a5dcd1dc-4117-40b3-b3da-74a56919e14b... ↗

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runoff best practicable sound abatement
contaminants and residual material, within a techniques to prevent tonal sounds and
designated area. impulse sounds or, if such tonal and
B. Noise impulse sounds cannot be prevented, to
1. The level of sound, measured by a sound minimize the impact of such sounds in
level meter with frequency weighting residential zones. Tonal sound is defined as
network (manufactured according to a sound wave usually perceived as a hum
standards prescribed by the American or which because its instantaneous sound
National Standards Institute, Inc.), pressure varies essentially as a simple
inherently and recurrently generated sinusoidal function of time. Impulse sounds
within the EWPZ between the hours of are defined as sound events characterized
7:00 p.m. and 7:00 a.m. from facilities or by brief excursions of sound pressure,
operations commenced on or after July 1, each with a duration of less than one
1988, shall not exceed 55 decibels on the A second.